01 - Preheat oven to 225°F. Line a baking sheet with parchment paper.
02 - In a clean mixing bowl, beat egg whites with cream of tartar until soft peaks form.
03 - Gradually add superfine sugar, 1 tablespoon at a time, beating until stiff, glossy peaks form and the mixture is smooth, about 5 to 7 minutes. Mix in vanilla extract and cornstarch.
04 - Spoon or pipe 8 portions of meringue onto the prepared baking sheet, shaping each into a tall ghostly figure with a swirling tip.
05 - Place mini chocolate chips or pipe black gel to create eyes and mouths for each ghost.
06 - Bake for 1 hour and 15 minutes, or until meringues are dry to the touch and easily lift off the paper. Turn off the oven, crack the door, and cool the meringues inside the oven completely.
07 - Whip heavy cream with powdered sugar and vanilla extract until soft peaks form.
08 - Right before serving, gently top each meringue with whipped cream and a spoonful of mixed fresh berries.